荥巩煤田位于豫西强变形区的嵩山背斜北翼，区内断块组合特征明显，聚煤期后构造变形对二1煤层的改造强烈。通过分析煤田构造、二1煤层及煤岩特征对煤层瓦斯赋存的影响，认为层间滑动断层是煤田中普遍发育的一种构造样式，印支期嵩山地区存在着区域性的顺二1煤层发育的层间滑动断层，层间滑动引起的煤层流变造成了“三软”构造煤的发育和煤层厚度的剧烈变化，煤厚的变化及煤体结构的破坏是煤层瓦斯赋存不均衡和突出的根本原因。%The Xinggong coalfield lies in the north limb of Songshan anticline, western Henan strongly deformed zone. Fault block as-semblages is significant in the area, post coal accumulation stage structural deformation has strongly reformed the coal II 1. After ana-lyzed the impacts from coalfield structure, coal II1 and coal lithotype on coal seam gas hosting, considered that the interlayer gliding faults are widely developed in the coalfield. During the Indo-Chinese epoch, coal II1 bedding interlayer gliding faults existed regionally and caused the rheology of coal seams and finally brought up“three soft”(soft roof, coal and floor) tectonoclastic coal and dramatically changed coal seam thicknesses. The coal thickness changes and coal structure destruction are basic reasons of coal seam gas hosting disproportion and outburst.
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